You can make a velocity microphone by subtracting two closely spaced omnis. I saw a paper on making ambisonic recordings like this a couple of years ago: http://www.aes.org/e-lib/browse.cfm?elib=15389 The problems, though, are spatial aliasing at high frequencies and lack of sensitivity at low frequencies. These would both need addressing in a practical system.
Best wishes Tim ==================================================== Dr. Tim Collins Electronic, Electrical and Computer Engineering University of Birmingham Edgbaston, Birmingham, B15 2TT, UK www.eee.bham.ac.uk/collinst ==================================================== -----Original Message----- From: Mike Felton [mailto:[email protected]] Sent: 08 January 2013 00:21 To: Surround Sound discussion group Subject: Re: [Sursound] Array for sound field recording and extend the sound image >The mics are omnis It might be stating the obvious here but how would you get ANY directional information out of four OMNI mics close together? :-) Surely to get a fig-8 response you need two CARDIODS back to back (one of which is polarity reversed obviously). Mike Felton _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound
